B747 CHAPTER 27

27

AIL

1. AIL:
        OUTER: -15 TO +25, A LOCKOUT MECH PREVENT OUTER MOVE WHEN FLAP RET
        INNER: -20 TO +20
2. BOTH CONT COLUMN MOVE GOES TO L/H AIL CCA (IS IN R/H WING W/W)
3. R/H CCA PREVENTED FOR SAFETY BY LOST MOTION DEVICE
4. A/P A USES R/H AIL CCA USE HYD3,4
5. A/P B USES L/H CCA WITH HYD1,2
6. AIL POS TX IS ON OUTERS AND SPOILER4,12 (ZERO IND IN HI SPD)
7. AIL TRIM DONE BY AN ELEC ACTUATOR ON L/H CCA
8. 4 FLT CONT S/O VLV FOR AIL AND SPOILERS ARE IN WING REAR SPAR
     AND 4 USED FOR ELEV AND RUDD IN STAB COMPARTMENT

SPOILER

1. 6 SPOILER EACH WING:
                                           5 IN FLT MAX 20
                                           1 IN GND: 6 AND 7 MAX 45°
2. AIL MOVEMENT FROM CCA GOES TO MIXER FOR FLT SPOILER MOVE
3. SPOILER HANDLE LOCKED IN FLT POS
4. RATIO CHANGER OP BY A VLV TO INCREASE SPOILER EXT TO 45°
5. RATIO CHANGER PREVENTS SPOILER5,8 TO MOVE >20 IN FLT
6. GND SPOILERS HAS 3 POS (0,20,45) BUT FLT HAVE ANY POS
7. AUTO SPD BRK LIT ON IF :
                                                   DISAGREE BETWEEN THR AND ACTUATOR
                                                   FAULT OF HYD 1,4
                                                   TILT FAULT
                                                   ELEC FAILURE
8. THR1,3 MUST IDLE TO OPERATE SPD BRK (OR REVERSE2,4)

FLAP

1. LEADING EDGE FLAP:
                                       KRUGER: 11, 12, 13
                                       VARIABLE CAMBER
2. TRAIL EDGE FLAP INBOARD HAS NO BACK BRK AND TORQ LIM
3. LE FLAP HAS 4 HYD PDU:
                                              1 TO 5
                                              6 TO 8
                                              9, 10
                                              11 TO 13
4. EACH PDU HAS ALT ELEC MOTORTE FLAPS HAS 2 PCU:
                     INBORD: HYD1
                     OUTB: HYD4, IT HAS BYPASS VLV TO CUT HYD IN ALT MOTOR OPERATION
5. TE FLAP MAX EXT:
                                   HI SPD (>178KNS): IS 25°
                                   LO SPD: IS 30°
                                   *BY SPD SENSOR IN MEC
6. EACH LE HAS 2 LIT ON P4:
                                                 GREEN: POS REACHED
                                                 AMBER: TRANSIT OR DISAGREE
7. T/O WARN IF LE NOT EXT OR TE NOT IN T/O RANGE OR SPD BRK NOT ARM
8. L/H INB FLAP POS TX GOES TO STALL WARN COMP

STAB

1. STAB HYD MOTORS:
                                 L/H: HYD2
                                 R/H HYD3
2. SECONDARY BRK APPLIED TO GEARBOX OUTPUT
3. RELEASE LIT ON IF BRK NOT APPLIED
4. HYD MOTORS HAVE 4 SOLE FOR: CONT, ARM, A/P, ELEC
5. HYD MOTORS GETAUX PITOT( SPD )AND FLAP POS TO DECREASE RATE IN HI SPD
6. STAB SW:
                 CUTOUT: IN MEC PREVENT MOVE OPPOSITE TO ELEV
                 CUTOFF: ON PEDESTAL TO CUT HYD
7. GREEN BAND LIT (AMBER) WILL ON IF DISCREPANCY BETWEEN ITS SW AND NOSE L/G SW

ELEV

1. A/P USE INNER ELEV PCU
2. POS TX IS ON OUT ELEV
3. ELEV FEEL LIT ON BY FEEL COMPUTOR IF 25% DIFF BETWEEN 2 SYS
4. FEEL COMP INPUTS:
STAB POS
AUX PITOT
∆P SW

5. INNER ELEV CONN TO OPPOSITE OUTER ELEV
6. STALL WARN COMP IS IN P5 (O/H)
7. 747-SP HAS OVER ROTATION COMP IN E1
8. IF OVER ROTATION SENSED IN BODY AND N L/G NOT GND, OVR ROT CMPTR SEND SIG TO STALL WARN TO ACTIVE STICK SHAKER

RUDD

1. RUDD RATIO CHANGER REDUCES DEFLECTION TO 5° AT HI SPD(AUX P/S)
2. RATIO CHANGER HAS NO OUTPUT WHEN APU OR EXT PWR ON
3. 2 POS TX FOR EACH RUDD
4. ON ADI, RATE OF TURN SHOWN BY Y/D COMP